It's always hard to convince "normies" to use encryption. I would say everyone should use Signal. Zuckerberg bought Whatsapp and will slowly dssolve it. France kidnapped (yes kidnapped) Telegram's creator and didn't release him until he gave up a backdoor into the app, it's safe to say that has been shared around the world.

https://www.techradar.com/computing/cyber-security/should-you-ditch-unencrypted-messaging-apps-heres-what-the-experts-say-about-the-fbis-warning